docker compose yaml - command - mysql

Question

I want to run a creation of a new database using mysql
this is the snippet I have in my docker-compose.yml file
mysql:
image: mysql
container_name: mysql-machine
ports:
- 3306:3306
environment:
MYSQL_ALLOW_EMPTY_PASSWORD: true
MYSQL_DATABASE: mxdb
MYSQL_USER: mxdb
MYSQL_PASSWORD: mxdb
command: mysqladmin create testing_db
Now when i run docker-compose up
I watch the console, and it says
mysql_1 | mysqladmin: connect to server at 'localhost' failed
mysql_1 | error: 'Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)'
mysql_1 | Check that mysqld is running and that the socket: '/var/run/mysqld/mysqld.sock' exists!
So how do I re-write the command piece, so i get the service working properly?
I want to create more than one database. So manually using commands is the easiest way.

Answer 1

I think you should run the mysql container and then have another container do the data import. Example:
.credentials
MYSQL_ALLOW_EMPTY_PASSWORD=true
MYSQL_USER=mxdb
MYSQL_PASSWORD=mxdb
MYSQL_DATABASE=mxdb
Run the container:
docker run --name mydb -d --env-file .credentials mysql
If you want to import data from file, create a new container, link to the one that is already running and do the import:
docker run --rm -t --link mydb:DB -v /path/to/dump.sql:/dump.sql mysql bash -c "mysql -h DB -u mxdb -pmxdb mxdb < /dump.sql"
If you just want to run a command, use:
docker run --rm -t --link mydb:DB mysql mysql -h DB -u mxdb -pmxdb -e "CREATE DATABASE bar"
or
docker exec -t mydb mysql -u mxdb -pmxdb -e "CREATE DATABASE bar"

Answer 2

I don't think you should override the command to create the database.
In docker-compose, the command should be the command to start the given service in the docker image. In your case, the service is a MySQL server. If you gives a command for the mysql service in your docker_compose.yml, the MySQL server will never start.
What you should do is start the mysql service, and then run commands in it.
mysql:
image: mysql
container_name: mysql-machine
ports:
- 3306:3306
environment:
MYSQL_ALLOW_EMPTY_PASSWORD: true
MYSQL_DATABASE: mxdb
MYSQL_USER: mxdb
MYSQL_PASSWORD: mxdb
Start the service:
docker-compose up
Connect to it:
mysql -umxdb -pmxdb
Then create the database:
create database testing_db;
If you need to automatize this database creation, you could put these SQL commands in a file, and do when needed:
cat init_db.sql | mysql -umxdb -pmxdb

Answer 3

If you use this image of mysql: tutum/mysql
You can add the name of the database you want to create at startup as an environment variable:
environment:
-ON_CREATE_DB="newdatabase"
Another solution is to put a shell script on the command part. In the script you start mysql and then create databases and add users:
command : run.sh
And on you script:
/usr/bin/mysqld_safe &
mysqladmin create testing_db